Weather on August 21
Madison, WI
55 Years of Data
Avg High
81°F
Avg Low
57°F
Warmest
2003
81°F avg
Coldest
2004
58°F avg
About This Date
August 21st in Madison, WI typically brings warm summer weather, with average highs around 81°F and lows near 57°F. Over 55 years of records, the warmest August 21st was in 2003 (81°F average), while the coldest was 2004 (58°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 35% of August 21st dates historically, with the wettest August 21st recording 15.27" of rain. The last decade has been 2.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.8°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Madison, WI? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 78° | 59° | 69° | — | — |
| 2024 | 73° | 47° | 60° | — | — |
| 2023 | 92° | 63° | 77° | — | — |
| 2022 | 77° | 64° | 71° | 0.08" | — |
| 2021 | 88° | 66° | 77° | 1.02" | — |
| 2020 | 85° | 58° | 71° | — | — |
| 2019 | 82° | 64° | 73° | 0.03" | — |
| 2018 | 74° | 61° | 67° | 15.27" | — |
| 2017 | 79° | 64° | 71° | — | — |
| 2016 | 72° | — | — | 0.15" | — |
| 2015 | 71° | 51° | 61° | — | — |
| 2014 | 84° | 61° | 72° | 0.23" | — |
| 2013 | 86° | 67° | 76° | — | — |
| 2012 | 76° | 45° | 60° | — | — |
| 2011 | 81° | 59° | 70° | — | — |
| 2010 | 87° | 68° | 78° | 1.3" | — |
| 2009 | 75° | 60° | 68° | 0.2" | — |
| 2008 | 82° | 62° | 72° | — | — |
| 2007 | 68° | 64° | 66° | 1.17" | — |
| 2006 | 78° | 54° | 66° | — | — |
| 2005 | 85° | 57° | 71° | — | — |
| 2004coldest | 72° | 44° | 58° | — | — |
| 2003warmest | 94° | 69° | 81° | 0.08" | — |
| 2002 | 79° | 51° | 65° | — | — |
| 2001 | 80° | 53° | 67° | — | — |
| 2000 | 73° | 54° | 63° | — | — |
| 1999 | 80° | 53° | 67° | — | — |
| 1998 | 85° | 64° | 74° | 0.05" | — |
| 1997 | 69° | 53° | 61° | 0.05" | — |
| 1996 | 85° | 60° | 72° | — | — |
| 1995 | 83° | 58° | 70° | — | — |
| 1994 | 82° | 59° | 71° | — | — |
| 1993 | 80° | 52° | 66° | — | — |
| 1992 | 83° | 50° | 66° | — | — |
| 1991 | 80° | 42° | 61° | — | — |
| 1990 | 66° | 61° | 63° | 0.94" | — |
| 1989 | 83° | 54° | 68° | — | — |
| 1988 | 85° | 52° | 68° | — | — |
| 1987 | 83° | 48° | 65° | 0.3" | — |
| 1986 | 83° | 58° | 70° | — | — |
| 1985 | 74° | 48° | 61° | — | — |
| 1984 | 77° | 49° | 63° | — | — |
| 1983 | 90° | 63° | 76° | — | — |
| 1982 | 86° | 47° | 66° | — | — |
| 1981 | 82° | 50° | 66° | — | — |
| 1980 | 92° | 62° | 77° | 1.55" | — |
| 1979 | 79° | 57° | 68° | — | — |
| 1978 | 83° | 46° | 64° | — | — |
| 1977 | 73° | 55° | 64° | 0.33" | — |
| 1976 | 87° | 46° | 67° | — | — |
| 1975 | 81° | 65° | 73° | 0.13" | — |
| 1974 | 82° | 67° | 74° | 0.03" | — |
| 1973 | 80° | 51° | 66° | — | — |
| 1972 | 84° | 68° | 76° | 0.08" | — |
| 1971 | 88° | 67° | 77° | — | — |
55 years of data from UW ARBORETUM - MADISON